[PATCH 6.4 733/800] wifi: mt76: mt7921e: fix init command fail with enabled device

Greg Kroah-Hartman
2023-07-16T20:27:06Z

From: Quan Zhou <quan.zhou@mediatek.com>

commit 525c469e5de9bf7e53574396196e80fc716ac9eb upstream.

For some cases as below, we may encounter the unpreditable chip stats
in driver probe()
* The system reboot flow do not work properly, such as kernel oops while
rebooting, and then the driver do not go back to default status at
this moment.
* Similar to the flow above. If the device was enabled in BIOS or UEFI,
the system may switch to Linux without driver fully shutdown.

To avoid the problem, force push the device back to default in probe()
* mt7921e_mcu_fw_pmctrl() : return control privilege to chip side.
* mt7921_wfsys_reset() : cleanup chip config before resource init.

Error log
[59007.600714] mt7921e 0000:02:00.0: ASIC revision: 79220010
[59010.889773] mt7921e 0000:02:00.0: Message 00000010 (seq 1) timeout
[59010.889786] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59014.217839] mt7921e 0000:02:00.0: Message 00000010 (seq 2) timeout
[59014.217852] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59017.545880] mt7921e 0000:02:00.0: Message 00000010 (seq 3) timeout
[59017.545893] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59020.874086] mt7921e 0000:02:00.0: Message 00000010 (seq 4) timeout
[59020.874099] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59024.202019] mt7921e 0000:02:00.0: Message 00000010 (seq 5) timeout
[59024.202033] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59027.530082] mt7921e 0000:02:00.0: Message 00000010 (seq 6) timeout
[59027.530096] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59030.857888] mt7921e 0000:02:00.0: Message 00000010 (seq 7) timeout
[59030.857904] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59034.185946] mt7921e 0000:02:00.0: Message 00000010 (seq 8) timeout
[59034.185961] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59037.514249] mt7921e 0000:02:00.0: Message 00000010 (seq 9) timeout
[59037.514262] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59040.842362] mt7921e 0000:02:00.0: Message 00000010 (seq 10) timeout
[59040.842375] mt7921e 0000:02:00.0: Failed to get patch semaphore
[59040.923845] mt7921e 0000:02:00.0: hardware init failed

Cc: stable@vger.kernel.org
Fixes: 5c14a5f944b9 ("mt76: mt7921: introduce mt7921e support")
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: Juan Martinez <juan.martinez@amd.com>
Co-developed-by: Leon Yen <leon.yen@mediatek.com>
Signed-off-by: Leon Yen <leon.yen@mediatek.com>
Signed-off-by: Quan Zhou <quan.zhou@mediatek.com>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Message-ID: <39fcb7cee08d4ab940d38d82f21897483212483f.1688569385.git.deren.wu@mediatek.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/wireless/mediatek/mt76/mt7921/dma.c | 4 ----
drivers/net/wireless/mediatek/mt76/mt7921/mcu.c | 8 --------
drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 8 ++++++++
3 files changed, 8 insertions(+), 12 deletions(-)

--- a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
@@ -231,10 +231,6 @@ int mt7921_dma_init(struct mt7921_dev *d
if (ret)
return ret;

- ret = mt7921_wfsys_reset(dev);
- if (ret)
- return ret;
-
/* init tx queue */
ret = mt76_connac_init_tx_queues(dev->phy.mt76, MT7921_TXQ_BAND0,
MT7921_TX_RING_SIZE,
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -476,12 +476,6 @@ static int mt7921_load_firmware(struct m
{
int ret;

- ret = mt76_get_field(dev, MT_CONN_ON_MISC, MT_TOP_MISC2_FW_N9_RDY);
- if (ret && mt76_is_mmio(&dev->mt76)) {
- dev_dbg(dev->mt76.dev, "Firmware is already download\n");
- goto fw_loaded;
- }
-
ret = mt76_connac2_load_patch(&dev->mt76, mt7921_patch_name(dev));
if (ret)
return ret;
@@ -504,8 +498,6 @@ static int mt7921_load_firmware(struct m
return -EIO;
}

-fw_loaded:
-
#ifdef CONFIG_PM
dev->mt76.hw->wiphy->wowlan = &mt76_connac_wowlan_support;
#endif /* CONFIG_PM */
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -325,6 +325,10 @@ static int mt7921_pci_probe(struct pci_d
bus_ops->rmw = mt7921_rmw;
dev->mt76.bus = bus_ops;

+ ret = mt7921e_mcu_fw_pmctrl(dev);
+ if (ret)
+ goto err_free_dev;
+
ret = __mt7921e_mcu_drv_pmctrl(dev);
if (ret)
goto err_free_dev;
@@ -333,6 +337,10 @@ static int mt7921_pci_probe(struct pci_d
(mt7921_l1_rr(dev, MT_HW_REV) & 0xff);
dev_info(mdev->dev, "ASIC revision: %04x\n", mdev->rev);

+ ret = mt7921_wfsys_reset(dev);
+ if (ret)
+ goto err_free_dev;
+
mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA, 0);

mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0xff);